802.1P CoS Bit Set for PPP and PPPoE Control Frames
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- Arthur Hensley
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1 802.1P CoS Bit Set for PPP and PPPoE Control The 802.1P CoS Bit Set for PPP and PPPoE Control feature provides the ability to set user priority bits in the IEEE 802.1Q tagged frame to allow traffic prioritization. This capability enables a way to provide best-effort quality of service (QoS) or class of service (CoS) at Layer 2 without requiring reservation setup. Finding Feature Information, page 1 Prerequisites for 802.1P CoS Bit Set for PPP and PPPoE Control, page 1 Restrictions for 802.1P CoS Bit Set for PPP and PPPoE Control, page 2 Information About 802.1P CoS Bit Set for PPP and PPPoE Control, page 2 How to Configure 802.1P CoS Bit Set for PPP and PPPoE Control, page 3 Configuration Examples for 802.1P CoS Bit Set for PPP and PPPoE Control, page 3 Additional References, page 5 Feature Information for 802.1P CoS Bit Set for PPP and PPPoE Control, page 6 Finding Feature Information Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to An account on Cisco.com is not required. Prerequisites for 802.1P CoS Bit Set for PPP and PPPoE Control The PPPoE over 802.1Q VLAN feature must be enabled. 1
2 Restrictions for 802.1P CoS Bit Set for PPP and PPPoE Control 802.1P CoS Bit Set for PPP and PPPoE Control Restrictions for 802.1P CoS Bit Set for PPP and PPPoE Control You cannot set different CoS levels for PPP and Point-to-Point Protocol over Ethernet (PPPoE) control packets; all control packets default to a CoS level set at 0. Information About 802.1P CoS Bit Set for PPP and PPPoE Control To configure the 802.1P CoS Bit Set for PPP and PPPoE Control feature, you should understand the following concepts: The command can help troubleshoot 802.1P control frame marking: debug pppoe error Benefits of 802.1P CoS Bit Set for PPP and PPPoE Control The 802.1P CoS Bit Set for PPP and PPPoE Control feature facilitates moving from ATM-based to Ethernet-based networks by supporting the ability to offer prioritized traffic services, Voice over Internet Protocol (VoIP), and other premium services. Feature Design of 802.1P CoS Bit Set for PPP and PPPoE Control The IEEE 802.1P specification is an extension of the IEEE 802.1Q VLANs tagging standard and enables Layer 2 devices to prioritize traffic by using an 802.1P header that includes a three-bit user priority field. If congestion occurs when the 802.1P CoS bit is not set, PPP keepalive packets can be lost, which can result in disconnection of an established session with loss of service to the end user. Congestion caused by noncontrol packets can also prevent new sessions from being established, which also can result in denying service to the end user. PPPoE sessions established over 802.1Q VLANs use the priority header field to provide best-effort QoS or CoS at Layer 2 without involving reservation setup P traffic is marked and sent to the destination, and no bandwidth reservations are established. In Cisco IOS XE Release 2.4, PPPoE sessions established over IEEE 802.1Q VLAN make use of the priority field of the IEEE 802.1p header by setting the CoS field to user priority 7. During network congestion, when the Ethernet network and digital subscriber line access multiplexer (DSLAM) offer 802.1P support, control packets are offered a higher priority than noncontrol packets, thereby increasing the likelihood of reliable delivery. PPPoE control packets and PPP packets originating from the broadband remote access server (BRAS) are marked with user priority 0, the highest level of priority. The following packets are tagged with user priority 0 in their 802.1P header: PPPoE packets PPPoE Active Discovery Offer (PADO) PPPoE Active Discovery Session Confirmation (PADS) 2
3 802.1P CoS Bit Set for PPP and PPPoE Control How to Configure 802.1P CoS Bit Set for PPP and PPPoE Control PPP packets Link Control Protocol (LCP) Network Control Protocol (NCP) (Internet Protocol Control Protocol (IPCP)) Authentication Keepalive How to Configure 802.1P CoS Bit Set for PPP and PPPoE Control The 802.1P CoS Bit Set for PPP and PPPoE Control feature is enabled by default and requires no configuration. Configuration Examples for 802.1P CoS Bit Set for PPP and PPPoE Control The following task explains how to change the CoS setting for PPP and PPPoE control frames over 802.1Q VLAN. Setting 802.1P Priority Bits in 802.1Q Containing PPPoE Control Packets This task explains how to change the CoS settings for PPP and PPPoE control frames over 802.1Q VLAN. SUMMARY STEPS 1. enable 2. configure terminal 3. bba-group pppoe group-name 4. control-packets vlan cos priority 5. exit 6. bba-group pppoe group-name 7. control-packets vlan cos priority 8. exit DETAILED STEPS Step 1 Command or Action enable Purpose Enables privileged EXEC mode. 3
4 Setting 802.1P Priority Bits in 802.1Q Containing PPPoE Control Packets 802.1P CoS Bit Set for PPP and PPPoE Control Command or Action Purpose Enter your password if prompted. Step 2 Router> enable configure terminal Enters global Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Router# configure terminal bba-group pppoe group-name Router(config)# bba-group pppoe global control-packets vlan cos priority Router(config-bba-group)# control-packets vlan cos 5 exit Router(config-bba-group)# exit bba-group pppoe group-name Router(config)# bba-group pppoe cisco control-packets vlan cos priority Router(config-bba-group)# control-packets vlan cos 2 exit Router(config-bba-group)# exit Specifies the BBA group and enters BBA group Sets the PPPoE control packets associated with the BBA group. Exits BBA group configuration mode, and returns to global Specifies the BBA group cisco and enters BBA group Sets the PPPoE control packets associated with the BBA group. Exits BBA group configuration mode, and returns to global 4
5 802.1P CoS Bit Set for PPP and PPPoE Control Additional References Additional References The following sections provide references related to the 802.1P CoS Bit Set for PPP and PPPoE Control feature. Related Documents Related Topic Broadband access aggregation concepts Broadband access commands Document Title Cisco IOS XE Broadband and DSL Configuration Guide Cisco IOS Broadband Access Aggregation and DSL Command Reference Standards Standard IEEE Standard 802.1P IEEE Standard 802.1Q Title PPPoE over IEEE 802.1Q Virtual Bridged Local Area Networks MIBs MIB No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. MIBs Link To locate and download MIBs for selected platforms, Cisco IOS XE software releases, and feature sets, use Cisco MIB Locator found at the following URL: RFCs RFC RFC 2516 Title PPP over Ethernet 5
6 Feature Information for 802.1P CoS Bit Set for PPP and PPPoE Control 802.1P CoS Bit Set for PPP and PPPoE Control Technical Assistance Description The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. Link Feature Information for 802.1P CoS Bit Set for PPP and PPPoE Control The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to An account on Cisco.com is not required. Table 1: Feature Information for 802.1P CoS Bit Set for PPP and PPPoE Control Feature Name 802.1P CoS Bit Set for PPP and PPPoE Control Releases Cisco IOS XE Release 2.4 Feature Information The 802.1P CoS Bit Set for PPP and PPPoE Control feature provides the ability to set user priority bits in the IEEE 802.1Q tagged frame to allow traffic prioritization. This capability enables a way to provide best-effort QoS or CoS at Layer 2 without requiring reservation setup. In Cisco IOS XE Release 2.4, this feature was introduced. The following command was introduced: control-packets vlan cos. 6
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